Has anyone else had this problem?

I had a baby in August and when I got my next period on sept 13 I started taking the minastrin 24 fe pill and I bleed for almost a whole month I stop bleeding oct 5 but only because I stopped taking it I didn't even finish the pack & now I got my period again oct 29 So I'm not sure if the pill is real affective! Or was it like that because I just had a baby and my hormones are all over the place?